510651255881 has 4 divisors (see below), whose sum is σ = 549932121732. Its totient is φ = 471370390032.

The previous prime is 510651255871. The next prime is 510651255901. The reversal of 510651255881 is 188552156015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26457950281 + 484193305600 = 162659^2 + 695840^2 .

It is a cyclic number.

It is not a de Polignac number, because 510651255881 - 2¹⁰ = 510651254857 is a prime.

It is a super-2 number, since 2×510651255881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (510651255811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19640432906 + ... + 19640432931.

It is an arithmetic number, because the mean of its divisors is an integer number (137483030433).

Almost surely, 2^510651255881 is an apocalyptic number.

It is an amenable number.

510651255881 is a deficient number, since it is larger than the sum of its proper divisors (39280865851).

510651255881 is a wasteful number, since it uses less digits than its factorization.

510651255881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39280865850.

The product of its (nonzero) digits is 480000, while the sum is 47.

The spelling of 510651255881 in words is "five hundred ten billion, six hundred fifty-one million, two hundred fifty-five thousand, eight hundred eighty-one".